Study on Optimal Working Conditions for Picking Head of Self-Propelled Pepper Harvester by Factorial Test

Kang, Kyung-Sik;Park, Hoon-Sang;Park, Seung-Je;Kang, Young-Sun;Kim, Dae-Cheol

  • Received : 2015.12.24
  • Accepted : 2016.02.22
  • Published : 2016.03.01


Purpose: Pepper prices have risen continuously because of a decrease in cultivation area; therefore, mechanical harvesting systems for peppers should be developed to reduce cost, time, and labor during harvest. In this study, a screw type picking head for a self-propelled pepper harvester was developed, and the optimal working conditions were evaluated considering helix types, winding directions of helix, and rotational speeds of the helix. Methods: The screw type was selected for the picking head after analyzing previous studies, and the device consisted of helices and a feed chain mechanism for conveying pepper branches. A double helix and a triple helix were manufactured, and rotational speeds of 200, 300, and 400 rpm were tested. The device was controlled by a variable speed (VS) motor and an inverter. Both the forward and reverse directions were tested for the winding and rotating directions of the helix. An experiment crop (cultivar: Longgreenmat) was cultivated in a plastic greenhouse. The test results were analyzed using the SAS program with ANOVA to examine the relationship between each factor and the performance of the picking head. Results: The results of the double and triple helix tests in the reverse direction showed gross harvest efficiency levels of 60-95%, mechanical damage rates of 8-20%, and net marketable portion rates of 50-80%. The dividing ratio was highest at a rotational speed of 400 rpm. Gross harvest efficiency was influenced by the types of helix and rotational speed. Net marketable portion was influenced by rotational speed but not influenced by the type of helix. Mechanical damage was not influenced by the type of helix or rotational speed. Conclusions: Best gross harvest efficiency was obtained at a rotational speed of 400 rpm; however, operating the device at that speed resulted in vibration, which should be reduced.


Factorial test;Pepper harvester;Picking head;Screw type;Working conditions


  1. Choi, Y. 2006. Development of Machine Harvester for Pepper. DS thesis. Kwangju, Jeonnam : Jeonnam national university. Department of Agricultural Engineering.
  2. Choi, Y., H. J. Jeon, E. W. Choi, S. W. Kim, Y. G. Kim and T. K. Kang. 2015. Conditions and measures of agriculture mechanization for upland crop. Symposium of Center for Food, Agricultural Tural & Rural policy. 54(2):163-185.
  3. Hong, J. T., K. H. Jo, N. H. Jo, J. K. Hong, Y. Choi, S. Y. Shin and C. K. Choi. 2006. Study on Integrated Mechanization System for Harvest and Postharvest Operation of Onceover-harvest Pepper. Symposium of Korean Society for Agricultural Machinery 11(2):184-189 (In Korean).
  4. KOSTAT (Statistics Korea) 2013. Report material of research result for cultivation area of pepper. Statistics Korea. Daejeon, Republic of Korea: National Statistics service. Available at:
  5. KOSTAT (Statistics Korea) 2014a. Main input quantity and time of pepper. Statistics Korea. Daejeon, Republic of Korea: National Statistics service. Available at:
  6. KOSTAT (Statistics Korea) 2014b. Input time of labor for cultivation scale and kind of working. Statistics Korea. Daejeon, Republic of Korea: National Statistics service. Available at:
  7. Lee, J. H., B. I. Choi, S. J. Park, J. Y. Lee, C. S. Kim and Y. H. Kim. 1994. Breeding Pepper Varieties for Onceover Harvest and Development of Machine Harvester. Jeonju: Rural Development Administration (In Korean).
  8. MIFAFF (Ministry for Food, Agriculture, Forestry and Fisheries) 2010. Agriculture and forestry of statics annual report. Ministry for Food, Agriculture, Forestry, and Fisheries. Sejong, Republic of Korea: National agriculture information service. Available at:
  9. Paul, A. F. and S. J. Walker. 2010. Evaluation of five green chile cultivars utilizing five different harvest mechanisms. Applied Engineering in Agriculture 26(6):955-964.
  10. Paul, A. F., S. J. Walker and R. P. Herbon. 2011. A system approach to chile harvest mechanization. International Journal of Vegetable Science 17:296-309.
  11. SAS. 1990. SAS User's Guide: Statistics. Ver. 9.3 Cary, NC: SAS Institute, Inc.
  12. Wall, M. M., S. J. Walker, A. D. Wall, E. Hughs and R. Phillips. 2003. Yield and Quality of Machine Harvested Red Chile Peppers. Horttechnology 13(2).


Grant : 첨단기자재생산

Supported by : 동양물산기업 중앙기술연구소